Guest kyuss Posted January 7, 2011 Share Posted January 7, 2011 Hey there. I have a 2jz motor running a billet 6765 and 18psi on pump gas. I just bent a rod in cylinder #2 and the bottom of the piston skirt hit the crank..or so I was told. What could cause something like this to happen? Top of piston is fine and cylinder walls are fine. Thanks for any help. Quote Link to comment Share on other sites More sharing options...
Ian C Posted January 7, 2011 Share Posted January 7, 2011 Doesn't sound like det, and it's not gonna be crazy power, so maybe hydraulic lock caused by an injector locking open? Quote Link to comment Share on other sites More sharing options...
Guest kyuss Posted January 7, 2011 Share Posted January 7, 2011 Thanks much. I have been told that 90% of the time when this happens it is due to a mechanical over-rev or mis-shift. That did not happen in this situation so am trying to figure out what else might have been the cause. Thanks again. Quote Link to comment Share on other sites More sharing options...
Lude Posted January 7, 2011 Share Posted January 7, 2011 how would a mis shift possible casue a rod to bend? Quote Link to comment Share on other sites More sharing options...
Guest kyuss Posted January 7, 2011 Share Posted January 7, 2011 how would a mis shift possible casue a rod to bend? I have no idea, that is why I posted on here. I was told that a "money shift" causes this problem 90% of the time. I can't find any proof of that claim anywhere. So, figured I would ask. Thanks. Quote Link to comment Share on other sites More sharing options...
Ian C Posted January 8, 2011 Share Posted January 8, 2011 Over rev would fret the rod bolts and pick up a main bearing, or even snap a bolt. The force from overrevving is in the opposite direction to that needed to bend a rod, so it's certainly not that. You need to think about compressive forces, like det or hydraulicing, or even something mechanical like a valve dropping. As you say you've got clean pistons, it's not det or mechanical Have you got any pictures of the damage? Quote Link to comment Share on other sites More sharing options...
Guest kyuss Posted January 8, 2011 Share Posted January 8, 2011 Over rev would fret the rod bolts and pick up a main bearing, or even snap a bolt. The force from overrevving is in the opposite direction to that needed to bend a rod, so it's certainly not that. You need to think about compressive forces, like det or hydraulicing, or even something mechanical like a valve dropping. As you say you've got clean pistons, it's not det or mechanical Have you got any pictures of the damage? Thank you for the information. I only have pictures of the top of the pistons and cylinder walls. I will post those up shortly. Again, I really appreciate the help, I am not the most mechanical of sorts. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.